Interaction of sols of polysilicic acid with quaternized poly-4-vinylpyridines

Yermakova, L.N; Frolov, Yu. G.; Kasaikin, V.A.; Зезин, А. Б.; Kabanov, V.A.

doi:10.1016/0032-3950(81)90226-4

Cited by 12 publications

(5 citation statements)

References 9 publications

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“…The growth of silica particles is accompanied by strong cooperative interaction with PVA chains. Taking into account that the surface area per silanol group is ≈0.2 nm 2 , 32 we can calculate that a silica particle of 1À2 nm in diameter contains 15À60 SiÀOH groups, which is enough for this interaction.…”

Section: ' Results and Discussionmentioning

confidence: 99%

“…Silica nanoparticles can react with polymeric bases and cations via surface silanol groups. − This reaction obeys the laws of cooperative interpolymer reactions and gives immediate precipitation or stable solutions depending on the nature and chain length of the organic polymer, pH, ionic strength, and so on. In the case of the PVA–Si(OH) 4 system, condensation proceeds over hours (sometimes days) after starting the reaction.…”

Section: Resultsmentioning

confidence: 99%

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Poly(vinyl amine)–Silica Composite Nanoparticles: Models of the Silicic Acid Cytoplasmic Pool and as a Silica Precursor for Composite Materials Formation

et al. 2011

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The role of polymer (poly(vinylamine)) size (238-11000 units) on silicic acid condensation to yield soluble nanoparticles or composite precipitates has been explored by a combination of light scattering (static and dynamic), laser ablation combined with aerosol spectrometry, IR spectroscopy, and electron microscopy. Soluble nanoparticles or composite precipitates are formed according to the degree of polymerization of the organic polymer and pH. Nanoparticles prepared in the presence of the highest molecular weight polymers have core-shell like structures with dense silica cores. Composite particles formed in the presence of polymers with extent of polymerization below 1000 consist of associates of several polymer-silica nanoparticles. The mechanism of stabilization of the "soluble" silica particles in the tens of nanometer size range involves cooperative interactions with the polymer chains which varies according to chain length and pH. An example of the use of such polymer-poly(silicic acid) nanoparticles in the generation of composite polymeric materials is presented. The results obtained have relevance to the biomimetic design of new composite materials based on silica and polymers and to increasing our understanding of how silica may be manipulated (stored) in the biological environment prior to the formation of stable mineralized structures. We suspect that a similar method of storing silicic acid in an active state is used in silicifying organisms, at least in diatom algae.

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Section: ' Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Poly(vinyl amine)–Silica Composite Nanoparticles: Models of the Silicic Acid Cytoplasmic Pool and as a Silica Precursor for Composite Materials Formation

et al. 2011

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“…In general, both cases may occur in multicomponent polymer systems revealing a co-operative type of binding. [25,33,34] It should be emphasised that, at high magnitudes of reduced protein concentrations, free STI could not be detected in the system. This result implies that the denaturation parameters measured in the calorimetric experiments could be attributed to the protein bound to the polysaccharide.…”

Section: Resultsmentioning

confidence: 99%

Effect of polysaccharides on the stability and renaturation of soybean trypsin (Kunitz) inhibitor

et al. 2002

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“…Furthermore, the disproportionation phenomena mentioned earlier in this paper are often encountered in reactions between macromolecules such as interactions between linear polyelectrolytes with globular proteins [37], between polyelectrolytes and poly(silicic acid) solutions [38], and between poly-(ethylene glycol) and poly(methacrylic acid) in aqueous solutions [39]. It would appear that there are many similarities between colloids, sterically stabilized colloids, and interpolymer complexes.…”

Section: Polyelectrolyte Complexesmentioning

confidence: 98%

Review : Polyelectrolyte Complexes in Biomedical Applications

Petrak¹

1986

Journal of Bioactive and Compatible Polymers

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The recent advances in the preparation, characterization and biomedical applications of novel polymeric materials obtained by complexing polyelectrolytes in aqueous solutions are reviewed. A broad definition of a "polymeric complex" was adopted that includes not only stoichiometric and nonstoichiometric polyelectrolyte complexes but also some colloids and dispersions based on polymeric materials. The use of interpolymer complexes for modifying enzymes, for making special membranes, for stabilizing dispersions and for drug delivery is included.

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Interaction of sols of polysilicic acid with quaternized poly-4-vinylpyridines

Cited by 12 publications

References 9 publications

Poly(vinyl amine)–Silica Composite Nanoparticles: Models of the Silicic Acid Cytoplasmic Pool and as a Silica Precursor for Composite Materials Formation

Poly(vinyl amine)–Silica Composite Nanoparticles: Models of the Silicic Acid Cytoplasmic Pool and as a Silica Precursor for Composite Materials Formation

Effect of polysaccharides on the stability and renaturation of soybean trypsin (Kunitz) inhibitor

Review : Polyelectrolyte Complexes in Biomedical Applications

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